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Build: Require that _mm_set_epi64x() is usable to enable CLMUL support.
VS2013 doesn't have _mm_set_epi64x() so this way CLMUL gets disabled with VS2013. Thanks to Iouri Kharon for the bug report.
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2 changed files with 8 additions and 3 deletions
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@ -434,8 +434,9 @@ if(HAVE_IMMINTRIN_H)
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#if (defined(__GNUC__) || defined(__clang__)) && !defined(__EDG__)
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__attribute__((__target__(\"ssse3,sse4.1,pclmul\")))
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#endif
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__m128i my_clmul(__m128i a, __m128i b)
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__m128i my_clmul(__m128i a)
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{
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const __m128i b = _mm_set_epi64x(1, 2);
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return _mm_clmulepi64_si128(a, b, 0);
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}
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int main(void) { return 0; }
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@ -938,6 +938,8 @@ AC_CHECK_DECL([_mm_movemask_epi8],
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# For faster CRC on 32/64-bit x86 and E2K (see also crc64_fast.c):
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#
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# - Check for the CLMUL intrinsic _mm_clmulepi64_si128 in <immintrin.h>.
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# Check also for _mm_set_epi64x for consistency with CMake build
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# where it's needed to disable CLMUL with VS2013.
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#
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# - Check that __attribute__((__target__("ssse3,sse4.1,pclmul"))) works
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# together with _mm_clmulepi64_si128 from <immintrin.h>. The attribute
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@ -965,13 +967,15 @@ else
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#if (defined(__GNUC__) || defined(__clang__)) && !defined(__EDG__)
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__attribute__((__target__("ssse3,sse4.1,pclmul")))
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#endif
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__m128i my_clmul(__m128i a, __m128i b)
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__m128i my_clmul(__m128i a)
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{
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const __m128i b = _mm_set_epi64x(1, 2);
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return _mm_clmulepi64_si128(a, b, 0);
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}
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]])], [
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AC_DEFINE([HAVE_USABLE_CLMUL], [1],
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[Define to 1 if _mm_clmulepi64_si128 is usable.
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[Define to 1 if _mm_set_epi64x and
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_mm_clmulepi64_si128 are usable.
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See configure.ac for details.])
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AC_MSG_RESULT([yes])
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], [
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